What standard must fire dampers comply with?

Fire dampers must comply with UL 555, which is the standard for fire dampers used in HVAC systems. This standard establishes the performance criteria for fire dampers during a fire, ensuring that they effectively restrict the spread of fire and smoke through ducts and openings in fire-rated walls and floors. Proper adherence to UL 555 ensures that the dampers are tested under specific conditions and can withstand the high temperatures associated with a fire, maintaining the integrity of fire-rated assemblies and contributing to overall building safety.

While other UL standards mentioned focus on different aspects of fire protection and building material performance, UL 555 specifically addresses the reliable operation of fire dampers during a fire event, making it the correct reference for this requirement in mechanical code practices.